Circular D20 Tank Capacity (Imperial) ready reckoner calculator in plastic sleeve by Fearn Calculators limited

Made:
1965-1975 in Gateshead
Circular D20 Tank Capacity (Imperial) ready reckoner calculator

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Circular D20 Tank Capacity (Imperial) ready reckoner calculator
Science Museum Group
© The Board of Trustees of the Science Museum

Circular D20 Tank Capacity (Imperial) ready reckoner calculator in plastic sleeve by Fearn Calculators limited, Dunstan, Gateshead.

Details

Category:
Mathematics
Object Number:
1998-465
Materials:
plastic and complete
Measurements:
overall: 5 x 190 x 190 mm
type:
ready reckoner (engineering)
credit:
Mr J.C. Michie